makefile: remove emoji on Linux
makefile: remove emoji on Linux

These break the build on i386 in some very specific circumstances (where
/bin/sh breaks when handling unicode), and are completely useless when
it comes to actually building the project.

Signed-off-by: Aleksa Sarai <a8eb12d32d6ec07cdf737175ec7d4a0f1b4e1ee7@suse.de>

estesp/containerd,crosbymichael/containerd,dmcgowan/containerd,vdemeester/containerd,dmcgowan/containerd,mikebrow/containerd,crosbymichael/containerd,containerd/containerd,thaJeztah/containerd,miaoyq/containerd,containerd/containerd,miaoyq/containerd,mikebrow/containerd,estesp/containerd,vdemeester/containerd,thaJeztah/containerd